/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


/**
 * CesiumVRUtil class to provide helper functions.
 *
 * Thanks to @borismus. These function are taken from various parts of the
 * webvr polyfill boilerplate.
 */

var CesiumVRUtil = {};

CesiumVRUtil.base64 = function(mimeType, base64) {
  return 'data:' + mimeType + ';base64,' + base64;
};

/**
 * Checks if the current device is mobile.
 * 
 * @return {Boolean}
 */
CesiumVRUtil.isMobile = function() {
  var check = false;
  (function(a){if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4)))check = true})(navigator.userAgent||navigator.vendor||window.opera);
  return check;
};

/**
 * Checks if the current device in iOS
 * 
 * @return {Boolean}
 */
CesiumVRUtil.isIOS = function() {
  return /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
};

/**
 * Returns the wakelock implementation for the current mobile device.
 *
 * Use request() or release() on the returned object to use lock.
 * 
 * @return {WakeLock} a wake lock for the current device.
 */
CesiumVRUtil.getWakeLock = function() {
  function AndroidWakeLock() {
    var video = document.createElement('video');

    video.addEventListener('ended', function() {
      video.play();
    });

    this.request = function() {
      if (video.paused) {
        // Base64 version of videos_src/no-sleep.webm.
        video.src = CesiumVRUtil.base64('video/webm', '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');
        video.play();
      }
    };

    this.release = function() {
      video.pause();
      video.src = '';
    };
  }

  function iOSWakeLock() {
    var timer = null;

    this.request = function() {
      if (!timer) {
        timer = setInterval(function() {
          window.location = window.location;
          setTimeout(window.stop, 0);
        }, 30000);
      }
    }

    this.release = function() {
      if (timer) {
        clearInterval(timer);
        timer = null;
      }
    }
  }

  var userAgent = navigator.userAgent || navigator.vendor || window.opera;
  if (userAgent.match(/iPhone/i) || userAgent.match(/iPod/i)) {
    return iOSWakeLock;
  } else {
    return AndroidWakeLock;
  }
}